攻角对轴向约束模型加速过程超空泡影响的试验研究

Experimental research about the effects of attack angle on supercavitation of restrained model during axial accelerating

本文研究了模型攻角对轴向约束模加速运动中超空泡形态的影响。研究结果发现,对于小攻角或零攻角情形,合适的通气量可以在研究的自然空泡数范围内逐步形成超空泡。在一定的攻角范围内,攻角越大,要达到同样超空泡长度所需的通气量越多。当攻角大于某个值(本试验模型的此攻角为2.5度),无论通气量多大都无法形成超空泡。攻角对超空泡的影响和定常水洞试验结果相似。

The effects of attack angle on supercavitation were studied experimentally during accelerating.The tests revealed：For small or zero attack angles,supercavitating can be forming behind the cavitator of prototype at cavitation numbers within the investigated range and with enough air injection.For reaching the same length of cavity,the larger the attack angle the more ventilation is needed.When the attack angle is larger than certain value （for our model it lager than about 2.5°）,no supercavitation can be formed whatever the quantity of air injection increased.The trend of the influence of attack angle on supercavitating with ventilation is similar to that in steady case tested in water tunnels.